I can play the file in multiple players. I can edit the file in Microsoft's video editor. I can convert the file in VideoConverterFactory.I can't load it into VS Ultimate 2018 ("File Format Mismatch")The video was generated using PhotoFilmStrip.

Interestingly enough I just tried opening it in Cyberlink Power Director 16. First it took its time trying to opening what is after all only a 27 MB file. Then it came up with an error msg saying it couldn't open it because "the file is broken, an unsupported format, protected video content, or for some other reason".

Vegas Movie Studio 15 Platinum also couldn't open, though its error msg said the reason could not be determined.

Reading this, I wondered whether it was windows 10 as the primary culprit - after all, the latest build of win 10 force-fed to all users has been causing heart attacks all over, many emergency fixes issued.So, since I use 64 bit software on a 64bit motherboard but on win 7, I downloaded the file and tried it in all the versions of VS I have on my main PC. The media player in win 7 won't play it, but VLC 3.0.4 plays it fine. Both X8, X9, X10 and 2018 all gave a file mismatch error on importing to the timeline. And a look at the properties of it in windows (left click the file, properties, details tab) shows nothing for video or audio at all.